That is an "odd" one! I remember this happening a few years ago to people and it was fixed by changing the Max Calls and Busy Trigger on the affected phones. There is actually a doc related to this issue :)
Thanks for the responce Rob, I checked the Max calls and busy signal settings and they are at 4/2 which is pretty standard for out environment, but the phone is not grabbing any IP so could this be a call search space setting or maybe a partision issue?
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
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CUCM Database Replication is an area in which Cisco customers and
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